From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7)
Description of problem:
A long-standing bug that caused the Adobe Acrobat Reader plugin to
consume 100% of CPU wasfixed in Mozilla 1.7, at least partially (bug
198954 at bugzilla.mozilla.org).
The Fedora-packaged Mozilla 1.7.2-0.2.0 still suffers from the bug.
This appears to be because of the compilation options or patches in
the Fedora package. The problem is that Mozilla apparently performs
Gtk2 redraws constantly. The bug only affects Gtk2 builds. Gtk1
builds, such as mozilla.org binaries, work ok.
Compiling Mozilla 1.7.2 from the unpatched, pristine mozilla.org
sources gave binaries on which the Acrobat plugin worked without
problems. The compilation options were as follows:
export CXXFLAGS="-march=pentium3 -Os"
export CFLAGS="-march=pentium3 -Os"
The Acrobat plugin version tested is 5.0.8 for both the Mozilla
compiled from source with the above options (no problem) and Fedora's
mozilla-1.7.2-0.2.0 (100% of CPU consumed when plugin is loaded).
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Install Adobe Acrobat plugin for Mozilla.
2. Restart Mozilla.
3. Open a PDF file in Mozilla via plugin.
Actual Results: Mozilla / X consumes 100% of CPU for as long as the
plugin is loaded.
Expected Results: CPU should be idle after the plugin has loaded and
the PDF opened, if the user does not do anything.
The bug in bugzilla.mozilla.org has been reopened after it was
supposedly fixed in 1.7. I guess the bug can be triggered in with some
compile-time options even without the patches in the Fedora package.
The upstream bug has more information:
Fedora Core 2 is now maintained by the Fedora Legacy project for
security updates only. If this problem is a security issue, please
reopen and reassign to the Fedora Legacy product. If it is not a
security issue and hasn't been resolved in the current FC3 updates or
in the FC4 test release, reopen and change the version to match.